assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_16842  rdfs:label       formaldehyde     xsd:string  
1          0           graph  obo:CHEBI_16842  oio:id           CHEBI:16842      xsd:string  
1          0           graph  obo:CHEBI_16842  rdfs:subClassOf  obo:CHEBI_64708  _IRI        
1          0           graph  obo:CHEBI_16842  rdfs:subClassOf  obo:CHEBI_17478  _IRI        
1          0           graph  obo:CHEBI_16842  rdf:type         owl:Class        _IRI